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From:   Can Guo <quic_cang@quicinc.com>
To:     quic_cang@quicinc.com, bvanassche@acm.org, mani@kernel.org,
        adrian.hunter@intel.com, vkoul@kernel.org, beanhuo@micron.com,
        avri.altman@wdc.com, junwoo80.lee@samsung.com,
        martin.petersen@oracle.com
Cc:     linux-scsi@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v8 06/10] scsi: ufs: ufs-qcom: Set initial PHY gear to max HS gear for HW ver 4 and newer
Date:   Sat,  2 Dec 2023 04:36:12 -0800
Message-Id: <1701520577-31163-7-git-send-email-quic_cang@quicinc.com>
In-Reply-To: <1701520577-31163-1-git-send-email-quic_cang@quicinc.com>
References: <1701520577-31163-1-git-send-email-quic_cang@quicinc.com>
Precedence: bulk

Since HW ver 4, max HS gear can be get from UFS host controller's register,
use the max HS gear as the initial PHY gear instead of UFS_HS_G2, so that
we don't need to update the hard code for newer targets in future.

Reviewed-by: Nitin Rawat <quic_nitirawa@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
---
 drivers/ufs/host/ufs-qcom.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index aca6199..543939c 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1060,6 +1060,22 @@ static void ufs_qcom_advertise_quirks(struct ufs_hba *hba)
 		hba->quirks |= UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH;
 }
 
+static void ufs_qcom_set_phy_gear(struct ufs_qcom_host *host)
+{
+	struct ufs_host_params *host_params = &host->host_params;
+
+	host->phy_gear = host_params->hs_tx_gear;
+
+	/*
+	 * For controllers whose major HW version is < 4, power up the PHY using
+	 * minimum supported gear (UFS_HS_G2). Switching to max gear will be
+	 * performed during reinit if supported. For newer controllers, whose
+	 * major HW version is >= 4, power up the PHY using max supported gear.
+	 */
+	if (host->hw_ver.major < 0x4)
+		host->phy_gear = UFS_HS_G2;
+}
+
 static void ufs_qcom_set_host_params(struct ufs_hba *hba)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
@@ -1296,6 +1312,7 @@ static int ufs_qcom_init(struct ufs_hba *hba)
 	ufs_qcom_set_caps(hba);
 	ufs_qcom_advertise_quirks(hba);
 	ufs_qcom_set_host_params(hba);
+	ufs_qcom_set_phy_gear(host);
 
 	err = ufs_qcom_ice_init(host);
 	if (err)
@@ -1313,12 +1330,6 @@ static int ufs_qcom_init(struct ufs_hba *hba)
 		dev_warn(dev, "%s: failed to configure the testbus %d\n",
 				__func__, err);
 
-	/*
-	 * Power up the PHY using the minimum supported gear (UFS_HS_G2).
-	 * Switching to max gear will be performed during reinit if supported.
-	 */
-	host->phy_gear = UFS_HS_G2;
-
 	return 0;
 
 out_variant_clear:
-- 
2.7.4